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Explain this passage on the proof that the curvature of the vector function $r(t)$ is $\frac{|r'(t) \times r''(t)|}{ |r'(t)|³}$?

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Explain this step on the proof of the curvature of the vector $r(t)$?

edited Mar 22 '12 at 6:16

Jack
7,4811947

asked Mar 22 '12 at 5:40

Dokkat
261

Which part you don't understand? – Jack Mar 22 '12 at 6:21

Differentiate $T\times T=0$ and you are done – Blah Mar 22 '12 at 6:47

I don't get it... – Dokkat Mar 24 '12 at 7:26

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Explain this passage on the proof that the curvature of the vector function $r(t)$ is $\frac{|r'(t) \times r''(t)|}{ |r'(t)|³}$?

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